Sweeping !46600 from 22.0-mc20 to master. Fix bug in MergeTruthJetsTool where only the first event from each bunch-crossing was checked.

Atlas Nightlybuildrequested to merge
cherry-pick-15e37f31863-master into master

Fix bug in MergeTruthJetsTool where only the first event from each bunch-crossing was checked.

See merge request !46600 (merged)

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